Question

Find i1 in the circuit shown below if
thedependent voltage source is labeled 4v2.
(Roundyour answer to a whole number if needed.) *By the way,
thebattery symbol is different from my book then the one provided
bythis site, so I am not sure where the polarity goes for
thesymbol. In any case, just follow the + and - I stuckin. Circle
is voltage source, triangle is dependent voltagesource. I also
meant to put a omega in but couldn't find itunder Greek
symbols.

The answer given to me for this practice problem is:
i1 = -448mA

Is the book using current division to solve for i1? If thatthe case
I understand the first step, but I am lost as to how theymade it to
the second step. Where i1 go in the equation?!

Also, what is V3 suppose to mean? Is it the voltage at thepoint
between the two parallel lines perpendicular to the + and-?